Richard,
I agree that fire moving up into the fuel supply bin is a primary
concern. Not just because of the risk of a fire in a place not designed
for fire, but because it implies that the combustion process down below
is not in a steady state. I disagree that a seal on the bin is
necessary to minimize the risk of back burn. The beauty of a
'powerless', gadgetless, gravity based process is that a good deal of
risk is eliminated. After that it is a question of materials,
construction and air flow.
So at the time of writing this my stove has been running for four hours
and the temperature of the flowing pellets three inches above the stove
is 65C. These pellets are feeding at a rate of about 0.7 liters per hour.
Alex
On 23/10/2012 3:55 PM, Richard Stanley wrote:
From Lenny Hansen, several years ago, the point was made that one
would have to seal that feed tube from any incoming air, to minimise
the risk of back burn up the feed tube.
Richard Stanley
www.legacyfound.org <http://www.legacyfound.org>
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